Glowlamp



Jan. 5, 1937. s. E. GERTLER GLOW LAMP Filed April 10, 1956 11 UV m I NV 15 NTOR. UH. E. E 7/. 5/?

SAN

ATTORNEY.

Patented Jan. 5, 1937 t n-ED STATES anowmmr Samuel E. Gel-tier, New York, N. Y., assignor of one-half to Harry I. Stein, New York, N. Y.

Application April 10, 1938, serial No. 73,704

6 Claims.

This invention relates to glow lamps, more particularly to that type of lamp wherein the light emitting element, which is a closed.v conductor, is supported in a .transparent envelope containing an inert gas such as neon or argon gas, or from which all air and other gaseous substances have been exhausted, said lightemitting element "being subject to the inductive influence produced by high frequency electric ourrent located exteriorly of the envelope.

The present invention contemplates certain improvements over that disclosed in my co-pending application, Serial No. 51,376, filed Novemher 25th, 1935.

One of the objects of my invention is-to provide a new and improved envelope, within which the glow element is supported, which can be produced at a relatively low cost.

Another object of my invention is to provide a new and improved glow lamp within'which the glow member may be heated to as high atemperature as possible by induction without danger of melting the transparent envelope.

Another object of the invention is to provide a glow lamp of the above type with means for maintaining the transparent envelope in a relatively cool condition.

Another object of the invention is to so form the transparent envelope that deposits caused by the vaporization of the glow member will not be condensed on that part of the envelope through which passes the light emitted from the glow member.

Another object of the invention is to provide 5 an envelope for a glow lamp of such construction that deposits due to the vaporization of the glow member will condense on localities on the inner wall of the envelope which are not intended to transmit light.

A further object of the invention is to provide a new and improved glow lamp in which the transparent envelope can be manufactured of atransparent material having a relatively low melting pointsuch as glass, thereby eliminating 4s thenecessity of using quartz or such other high melting point materials which are difilcult to work.

. Other objects and aims of the invention, more or less specific than those referred to above, will so be in part obvious and in part pointed out in the course of the following description of the elements, combinations, arrangements of parts and applications of principles, constituting the invention; and the scope of protection contemplated will be indicated in the appended claims.

In the accompanying drawing wherein I have illustrated preferred forms of embodiments of my invention,

Figure 1 is a vertical sectional view taken through a glow lamp, the glow member and its 5 suplporting means being shown in side elevation, an r s Figure 2 is a similar view showing another embodiment of my invention.

At this point it may be'noted that I preferably 10 construct the glow member in a manner described in my aforementioned applicationso that the light will be emitted uniformly from all" parts of the surface'of the glow member. This is accomplished by increasing the thickness of the 15 metal from the periphery of the metallic disc from which the glow member is constructed toward the central axis of said disc along a curve of pre-determined plottage so that the magnetic induction combined with the normal heat conductivity of the material of the glow member will result in a body which has all of its parts heated equally so that the incandescence of the glow member will be equal throughout the entire body, thereby throwing a light beam,-every part of which is equal to the other parts in its degree of luminosity.

Referring now to the drawing wherein similar reference characters refer to similar parts in both views thereof and particularly to Figure 1, reference numeral i denotes an envelope which, in the present instance, is preferably formed of glass having a relatively highmelting point but having a much lower melting point than quartz or similar substances which are expensive and diificult to work. I have found that a glass knownin the'trade as "pyrex glass is suitable for the purpose intended.- In this figure of the drawing the envelope is shown as being substantially cylindrical in form, having a substantially flat light 40 emitting surface 2, and having at its opposite end a bowl" shaped part 3 whichextends int the cylinder.

Erected upon asupport by the part 3.is a post 4 and the upper end of the post 4 is provided 5 a with a plurality of prongs 5 and the glow member 6 is supported by the upper end of the prongs 5, preferably as shown. The glow member 6 has preferably a* flat light emitting surface I and a convex face 8, the convexity of'the face 8- being '50 formed on a curve of pre-determined plottage as I above described whereby the entire area of the light emitting surface I will have a uniform degree Of luminosity. I

Ofcourse, any one of the forms of glow mem- 66 bers illustrated in my aforementioned applicatlon may be utilized instead of the one illustrated herein.

The glow member 6 is preferably formed of tungsten and the supporting parts 4 and 5 are preferably formed of a high melting point metal such as tungsten. The reference numeral 9 denotes a coil which, in the present instance, is formed of hollow tubing, said coll being positioned exteriorly of the envelope I. This coil is disposed symmetrically with respect to the glow member, it being the intention to so arrange the glow member with respect to the coil that the center of the mass of the glow member will be located at the center of the inductive field produced by the high frequency electric current which energizes the coil. When the lamp is in operation, water is passed through the coil 9, the purpose of which is to maintain the wall of the envelope adjacent the glow member in a relatively cool condition. This construction permits of the envelope being made of a glass such as pyrex glass above mentioned.

Referring now to Figure 2 of the drawing, the construction is identical with the above described except that the light emitting end of the envelope I is of bulbous conformation as at In.

It will be noted that in both embodiments of the invention, the light emitting locality of the envelope is located at a substantial distance from the glow member and that the locality cooled by the hollow coil is relatively closer to the glow member. My object for this construction is to provide a glow lamp in which the vapor produced by the heated glow member will condense or be deposited upon the relatively cooler part of the inside wall of the envelope. When gas is employed in envelopes of glow lamps, such as illustrated, a certain amount of circulation is set up within the envelope, and it is intended that this circulation of gas within the envelope will carry the vapor produced from the glow member past the cooler locality whereby this vapor will be condensed and deposited upon the cooler surface and thereby prevent it from being condensed or deposited on the locality oi the envelope through which passes the beam of light produced by the glow member.

It will accordingly be seen that I have provided a lamp which can be produced at a modicum of cost and which will accomplish, among others, all the ends of the invention in a most facile manner.

As many changes could be made in this construction without departing from the scope of the following claims, it is intended that all matter contained in the above description or shown in the accompanying drawing shall be interpreted as illustrative only and not in a limiting sense.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. In a glow lamp of the class described, in combination, a translucent envelope, a solitary, disc-shaped glow member the material of which is relatively thin at its peripheral edge and relatively thicker at its central axis supported within said envelope, and a hollow coil positioned about said envelope and disposed coaxially with respect to said glow member.

2. In a glow lamp of the class described, in combination, a cylindrlcally formed envelope composed of glass having a relatively high melting point, a post erected within said cylinder, a solitary, disc-shaped glow member mounted upon said post, said glow member being relatively thin at its peripheral edge and becoming gradually thicker as it approaches its central axis and a hollow metallic coil encircling said cylindrically formed envelope, said coil being adapted to conduct water about said envelope so as to maintain the latter in a relatively cool condition.

3. In a glow lamp of the class described, in combination, a transparent cylindrically formed envelope composed oi a substance having a relatively high melting point, a post erected within said envelope, a solitary, disc-shaped glow member supported by said post, the material of said glowmember being so distributed that it is thinner at its peripheral edge than at its central axis, whereby heat produced by a current of high frequency in a coil coaxially disposed with respect to said glow member will inductively heat the latter, whereby the entire area of its light emitting surface will be uniformly heated, and a hollow coil located exteriorly of said cylindrically formed transparent matter and adapted to conduct water or other cooling medium about the latter.

4. In a glow lamp of the class described, in combination, a closed cylindrically formed cylinder filled with an inert gas such as neon or argon gas, said envelope being composed of a transparent substance having a relatively high melting point, a hollow coil disposed exteriorly of said envelope adapted to be charged with a high frequency current, a circular glow member suitably supported within said envelope so as to be ccaxially disposed with respect to said coil, said glow member being relatively thin at its outer edge and becoming relatively thicker in a direction toward its central axis and said glow member being so arranged within said cylinder that the light transmitting area of the cylinder is further removed from the glow member than parts of the cylinder not intended to transmit lig t.

5. In a glow lamp, in combination, a transpar- .ent cylindrically formed envelope formed of a relatively'high melting point glass, a circular glow member suitably supported within said cylinder, said glow member being thicker at its central axis than at its periphery, the lateral walls of said cylinder being relatively closer to the glow member thanis the end of the cylinder through which'light is transmitted, and a hollow coil encircling said cylinder, said coil also encircling said glow member and being coaxially disposed with regard to the latter, whereby the center of the mass of the glow member will be located in the center of an inductive field produced by said coil when the latter is energized by a current of high frequency, and said coil being adapted to conduct water about the said cylindrically formed envelope, whereby the area of the cylinder encircled by the coil will be kept relatively cooler than other areas of said cylinder.

6. In a glow member of the class described, in combination, a cylindrical envelope formed of glass, having a relatively high melting point, a glow member cylindrically supported within said cylinder comprising a circular disc formed of tungsten, said glow member having a circular periphery, all parts of which periphery are equidistant from the inner wall of the cylindrically formed envelope, and said glow member being relatively thin at its periphery and increasing in thickness toward its central axis, said cylinder being filled with an inert gas such as neon gas or argon .gas, the locality of said cylinder which 7- transmits light being located at a relatively cooler than other areasof said cylinder whereby greater distance from the glow member than vaporous substwesi ischarged from said glow the area which is not intended to transmit light, member condense on the cooler area of the a hollow coil encircling said cylinder and said inner wall of the cylinder rather than the area glow member and being coaxially disposedwitlrizhereo through which light emitted from the 6 respect to the latter andnsaidcoilbeing adapted glow member is transmitted.

- to mainta;in"the'" 'aiea encircled by it relatively SAMUEL E. GER'I'LER. 

